http://www.tognar.com/the-eliminator-custom-tongue-shims/
Maybe give these a try. I have similar issues ---skinny ankle with a low volume (but mine are wide too) foot. Luckily, it's less of an issue in my skates. Ive used the product above for ski boots and they work really well, but they are fairly thick, especially over the forefoot. You could always trim that though....